Update Diagnostics section. Advanced panel/ Data Choices no longer exists in Firefox 56. See also https://support.mozilla.org/en-US/kb/firefox-health-report-understand-your-browser-perf/discuss/7134
I set up a "Needs change" entry.

I have a revision pending to update the Diagnostics section for Fx56. I'll wait awhile to give Joni a chance to review the pending revisions to the related articles, [[Firefox Health Report - understand your browser performance]] and [[Share telemetry data with Mozilla to help improve Firefox]].
See:
[https://bugzilla.mozilla.org/show_bug.cgi?id=1400272 Bug 1400272] - The Firefox Health Report KB article needs a major rewrite for fx56
and
[https://bugzilla.mozilla.org/show_bug.cgi?id=1400476 Bug 1400476] - The "Share telemetry data with Mozilla to help improve Firefox" KB article should be rewritten for fx56